import sys
from decimal import *
setcontext(Context(prec=5000,rounding=ROUND_DOWN))
factorial=[1]
fac=Decimal('1')
for i in range(2,225):
 fac*=Decimal(i)
 factorial.append(fac)

while True:
 s=sys.stdin.readline()
 if not s:
  break
 s=Decimal(s)
 sin=s
 for i in range(5,225,4):
  sin+=(Decimal((s**Decimal(i)))/Decimal(factorial[i-1]))
 for i in range(3,225,4):
  sin-=(Decimal((s**Decimal(i)))/Decimal(factorial[i-1]))
 print("{:.50f}".format(sin))